import sys
	 
def is_prime(num):
        for j in range(2,num):
           if (num % j) == 0:
                return False
        return True
    
def main(argv):
          
       if (len(sys.argv) != 3):
            sys.exit('Usage: prime_numbers.py <lowest_bound> <upper_bound>')
	 
       low = int(sys.argv[1])
       high = int(sys.argv[2])
	 
       for i in range(low,high):
            if is_prime(i):
                print i,
	 
if __name__ == "__main__":
	 main(sys.argv[1:])
